Ellis Emperor Cable Cleats For 11kV High Voltage Substation Cables (UKPN Approved)

By Chris Dodds on 11th September, 2014

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Ellis Emperor Cable Cleats For 11kV High Voltage Substation Cables (UKPN Approved)

Substations, Short Circuiting And Cable Cleats.

Ellis Patents Emperor cable cleats are specified and installed by most UK DNO's for the short-circuit restraint and protection of high voltage power cables, this includes 11kV single and 3 core cables.

Cable cleats used to restrain high voltage power cable to containment, whether cable tray, ladder or basket, within substations is absolutely key for protecting utility workers, cable installers and substation engineers.

Cable cleats, correctly specified according to the short-circuit fault level, provide protection to cables, substation, electric transformers and switchgear controlling the current being fed into them.

The power contained within a large substation can rise to 400kV - extremely high levels of power required by houses, hospitals and factories alike. 

Short circuiting occurs when an electrical circuit allows a current to flow up an unintended path encountering extremely low electrical impedance.

Effectively, a short circuit is when two nodes within the circuit designed to be at different voltages connect in an abnormal way.  

The result of this current flowing in the incorrect direction is that the two nodes encounter no resistance within the circuit resulting in a high level of power being delivered in an extremely small amount of time. 

The Requiment For Correct Cable Cleats During A Short CircuitVideo: The Requirement For Correct Cable Cleats During A Short Circuit

The short video seen here shows the power of a cable when a short circuit occurs and incorrect or under-specified stainless steel cable ties have been used. 

Ellis Patents And United Kingdom Power Networks (UKPN)

Ellis Patents are UK based manufacturers of stainless steel, aluminium and plastic cable cleats for cable applications the world over.

Ellis Patents provide solutions for cables used by many Distribution Network Operators (DNO) within the UK including UKPN who are the DNO (electrical utility) for London, South East and the East of England. UKPN own and maintain LV and HV cables and power networks including underground and overhead cables used and going into London Underground (LU).

T&D are approved vendors to UKPN and distribute an extensive range of UKPN approved LV HV cable jointing, cable protection and tooling products. 

Cables and and cable accessories used in areas such as London Underground must conform to high specifications ensuring that they will withstand a short circuit and not be harmful in the event of a fire. 

Emperor Cable Cleats And Choosing The Correct Product

The Emperor range of cable cleats from Ellis Patents are stainless steel and available for both single cable and trefoil cable applications. With trefoil cable cleats suitable for use with cables up to 128mm and single cleats up to 150mm, the Emperor cable cleats can support a wide range of power cables.

The range of Emperor cable cleats from Ellis Patents conform to the IEC 61914 standard which sets out the base requirements and tests that cable cleats must conform to.  

Pictured: Ellis Patents Emperor Cable Cleats Single & Trefoil.

Ellis Patents Emperor Cable Cleats Single & Trefoil Cleats

Offering excellent protection in harsh, hazardous area and high voltage installations, these cable cleats are designed to protect, cushion and support cable in the case of a short circuit.

The cable cleats have a low smoke and fume polymeric liner and base pad and it is these properties that contribute towards the Emperor range of cable cleats being approved for use on the London Underground and by UKPN. 

According to UKPN cable specification EDS 02-0940, 11kV XLPE insulated substation cables should have a LSOH (Low Smoke Zero Halogen) cable sheath. The LSF Emperor cable cleat liner and pad retains the halogen-free specification of both cable and cable cleat. 

As mentioned, cables can be going into substations with up to 400kV circulating within them. It is absolutely imperative that the cables within the substation are held together and protected in the correct way.

Short circuits can cause extreme electrical currents being unleashed within the cables - under specified or poor quality cable cleats can cause extreme damage. 

Product Specifications And Benefits. 

The range of Emperor cable cleats are often highly specified and this is a direct reflection upon the quality and assurance provided by Ellis Patents cleats. The fault current rating for the Emperor cleats is the highest available for any product of this type.

In addition to this and as previously mentioned, the product is low smoke and fume meaning in the case of a fire, no toxic halogens will be produced by the burning of the cleat.

The table below shows the levels of spacing required for short circuit tests of different voltages. 

It is these features that make the Ellis Patents range of Emperor cable cleats the safest choice when protecting against short circuits. 

Emperor Cable Cleat Short Circuit Test Results
Max S/C Test Level Cable Cleat Spacing
156kA 600mm
195kA 300mm
235kA 225mm

 

Video: Emperor Cable Cleats - Short Circuit Test

 
  • Further Ellis Patents reading

Ellis Patents Cable Guide Clamp - Video

Cable Cleats - The Ellis Patents Black Book Guide To Cable Cleats 

Cable Cleats From Ellis Patents - The Innovation Game 

Ellis Patents Pegasus Cable Hangers

 

Invitation

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Discussion subjects include cable installations, cable jointing, electrical substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.

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Ellis Patents Emperor Cable Cleat - Single Cable





Category:  Cable Cleats & Cable Ties

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